STOCK-BASED COMPENSATION PLANS - RSUS (Details) (Stock Incentive Plan [Member], USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options [Member]
Restricted Stock Units [Line Items]
Nonvested options recognized over weighted average period, years	2 years 4 months
Unrecognized compensation on nonvested stock options	$ 125
Vesting periods	4 years 0 months
Income Statement Impact From RSUs [Abstract]
Share-based compensation expense	85	70	65
Future income tax benefit recognized	31	24	23
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units [Line Items]
Nonvested options recognized over weighted average period, years	3 years 5 months
Unrecognized compensation on nonvested stock options	195
Restricted Stock Units Number of Options [Abstract]
Non-vested at beginning of period,	6,692,220	8,095,739	9,746,433
Granted	1,455,209	1,904,504	2,156,753
Vested	(1,787,894)	(2,995,553)	(3,380,251)
Forfeited	(460,341)	(312,470)	(427,196)
Non-vested at end of period,	5,899,194	6,692,220	8,095,739
Weighted average grant date fair value per share [Abstract]
Non-vested at beginning of period,	$ 60.04	$ 49.91	$ 41.35
Granted	$ 94.88	$ 75.73	$ 59.52
Vested	$ 53.63	$ 42.17	$ 31.84
Forfeited	$ 63.54	$ 56.58	$ 45.78
Non-vested at end of period,	$ 70.32	$ 60.04	$ 49.91
Income Statement Impact From RSUs [Abstract]
Share-based compensation expense	102	100	105
Future income tax benefit recognized	$ 37	$ 35	$ 37